1 /*
2 Copyright (C) 2011 Fredrik Johansson
3
4 This file is part of FLINT.
5
6 FLINT is free software: you can redistribute it and/or modify it under
7 the terms of the GNU Lesser General Public License (LGPL) as published
8 by the Free Software Foundation; either version 2.1 of the License, or
9 (at your option) any later version. See <http://www.gnu.org/licenses/>.
10 */
11
12 #include <stdlib.h>
13 #include "flint.h"
14 #include "fmpz_poly.h"
15 #include "fmpz_poly_mat.h"
16 #include "fmpz_mat.h"
17
18 void
fmpz_poly_mat_mul_KS(fmpz_poly_mat_t C,const fmpz_poly_mat_t A,const fmpz_poly_mat_t B)19 fmpz_poly_mat_mul_KS(fmpz_poly_mat_t C, const fmpz_poly_mat_t A,
20 const fmpz_poly_mat_t B)
21 {
22 slong i, j;
23 slong A_len, B_len;
24 int signs;
25 slong A_bits, B_bits, bit_size;
26
27 fmpz_mat_t AA, BB, CC;
28
29 if (B->r == 0)
30 {
31 fmpz_poly_mat_zero(C);
32 return;
33 }
34
35 A_len = fmpz_poly_mat_max_length(A);
36 B_len = fmpz_poly_mat_max_length(B);
37
38 A_bits = fmpz_poly_mat_max_bits(A);
39 B_bits = fmpz_poly_mat_max_bits(B);
40
41 signs = (A_bits < 0 || B_bits < 0);
42
43 bit_size = FLINT_ABS(A_bits) + FLINT_ABS(B_bits) + signs;
44 bit_size += FLINT_BIT_COUNT(FLINT_MIN(A_len, B_len));
45 bit_size += FLINT_BIT_COUNT(B->r);
46
47 /*
48 flint_printf("A: BITS %wd LEN %wd\n", A_bits, A_len);
49 flint_printf("B: BITS %wd LEN %wd\n", B_bits, B_len);
50 flint_printf("bit_size: %wd\n", bit_size);
51 */
52
53 fmpz_mat_init(AA, A->r, A->c);
54 fmpz_mat_init(BB, B->r, B->c);
55 fmpz_mat_init(CC, C->r, C->c);
56
57 for (i = 0; i < A->r; i++)
58 for (j = 0; j < A->c; j++)
59 fmpz_poly_bit_pack(fmpz_mat_entry(AA, i, j),
60 fmpz_poly_mat_entry(A, i, j), bit_size);
61
62 for (i = 0; i < B->r; i++)
63 for (j = 0; j < B->c; j++)
64 fmpz_poly_bit_pack(fmpz_mat_entry(BB, i, j),
65 fmpz_poly_mat_entry(B, i, j), bit_size);
66
67 fmpz_mat_mul(CC, AA, BB);
68
69 for (i = 0; i < C->r; i++)
70 for (j = 0; j < C->c; j++)
71 if (signs)
72 fmpz_poly_bit_unpack(fmpz_poly_mat_entry(C, i, j),
73 fmpz_mat_entry(CC, i, j), bit_size);
74 else
75 fmpz_poly_bit_unpack_unsigned(fmpz_poly_mat_entry(C, i, j),
76 fmpz_mat_entry(CC, i, j), bit_size);
77
78 fmpz_mat_clear(AA);
79 fmpz_mat_clear(BB);
80 fmpz_mat_clear(CC);
81 }
82